100+ Free NCIDQ IDIX Practice Questions

IDIX stands for the Interior Design Implementation Exam, one of three sections of the NCIDQ Examination administered by CIDQ. It tests the design-development and construction-documentation phases of interior design practice, focusing on codes and life safety, integration and FF&E, construction documents, consultant drawing coordination, and construction specifications and schedules. Beginning in April 2026, IDIX replaced the former PRAC (Practicum) exam. IDIX is delivered by computer at Prometric test centers or via remote proctoring, and it emphasizes protecting public health, safety, and welfare through code-compliant documentation.

Effective April 2026, CIDQ retired the PRAC (Practicum) exam and introduced IDIX based on its latest practice analysis. The old PRAC presented roughly three extended case-study scenarios that required interactive, scenario-based responses. IDIX instead uses about 130 standardized objective items: multiple-choice questions plus alternative item types such as fill-in-the-blank, hot spot, and drag-and-place. This makes IDIX fully objective and auto-scored, matching the format structure of the IDFX and IDPX sections, and it removes hand-drawn practicum work from the NCIDQ entirely.

The IDIX exam contains approximately 130 items and has a 4-hour time limit. About 15 of those items are unscored pretest questions that CIDQ uses to evaluate future content, so they do not count toward your score. The items include traditional multiple-choice questions plus alternative item types (fill-in-the-blank, hot spot, and drag-and-place). Because IDIX is the implementation and documentation section, many items reference construction drawings, schedules, codes, and specifications rather than purely conceptual knowledge.

The 2026 IDIX blueprint has five content areas with these approximate weights: Codes and Life Safety (16%), Integration and FF&E (19%), Construction Documents (32%), Consultant Drawing Coordination (18%), and Construction Specifications and Schedules (15%). Construction Documents is by far the heaviest area, so candidates should be very comfortable developing floor plans, demolition plans, reflected ceiling plans, elevations, sections, and custom details. The remaining areas test code review, systems and FF&E integration, coordinating consultant drawings, and writing specifications and schedules.

IDIX is scored on a scaled range of 200 to 800, and candidates must achieve a scaled score of 500 to pass. The scaled score accounts for slight differences in difficulty between exam forms, so the raw number of questions needed to pass can vary. Only the scored items (about 115 of the roughly 130 questions) count toward your result. CIDQ reports pass or fail rather than a percentage to candidates, and a failed section can be retaken in a later administration within your eligibility window.

For the 2026 exams, CIDQ references the 2021 International Building Code (IBC) and the related 2017 accessibility standard, ICC A117.1-2017, which the 2021 IBC adopts. IDIX candidates should know egress requirements (door swing direction at an occupant load of 50 or more, corridor widths, exit separation, common path of travel), occupant load calculation, fire-rated assemblies and penetration protection, interior finish flame-spread classes, and accessibility requirements such as the 60-inch turning space, 32-inch clear door opening, reach ranges, and accessible counter heights.

Because Construction Documents is 32% of the exam, prioritize mastering drawing types, conventions, dimensioning, and detailing. Study IBC 2021 and ICC A117.1-2017 thoroughly for the Codes and Life Safety area, and learn the CSI MasterFormat and SectionFormat (Part 1 General, Part 2 Products, Part 3 Execution) for specifications. Practice reading and coordinating reflected ceiling plans against mechanical and electrical drawings, and review how door, finish, hardware, and fixture schedules cross-reference the drawings. Most candidates spend 80 to 120 hours preparing specifically for IDIX.

Yes. The three NCIDQ sections (IDFX, IDIX, and IDPX) are independent and can be taken in any order, provided you meet CIDQ eligibility for the section. However, because IDIX is the implementation and documentation section, many candidates find it easier after they have gained construction-documentation experience and completed IDFX. Confirm your eligibility route and any work-experience requirements with CIDQ before scheduling, and budget time to study the heavily weighted Construction Documents area regardless of the order you choose.